Lamp support arm



FIG. 1 is a side elevation view of the lamp support arm in accordancewith my design, illustrating the environment of the support arm;

FIG. 2 is a front elevation view of the lamp support arm in accordancewith my design;

FIG. 3 is a side elevation view of the lamp support arm in accordancewith my design;

FIG. 4 illustrates the rear elevation view of the lamp support arm inaccordance with my design;

FIG. 5 illustrates the top view of the lamp support arm in accordancewith my design; and,

FIG. 6 illustrates the bottom plan view of the lamp support arm inaccordance with my design.

The right and left elevation views are symmetrical.

The broken line showing of environmental structure is for illustrativepurposes only and forms no part of the claimed design.

The ornamental design for the lamp support arm, as shown and described.